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Accurate mathematical models especially accurate hydrodynamic parameters of unmanned underwater vehicles (UUVs) are essential for good control performance. This paper provides a general framework for the hydrodynamic modeling of a small-scale UUV. In place of physical experiments such as captive model tests, a virtual model test and simulation was conducted via commercial computational fluid dynamics...
A nonlinear model of a flapping-wing micro aerial vehicle (MAV) is built in which the load acceleration and equivalent moment are formulated linearly in the body frame. The aerodynamic force and moment are not considered directly because the mass and moment of inertia of the flapping-wing MAV are too tiny. The visual measurement system (VMS) is taken to measure the flight data such as the position...
This paper presents a comprehensive modeling approach for tail-sitter hybrid UAVs featured by vertical take-off and landing (VTOL) and cruise flight capabilities. The modeling approach includes all essential components, such as full angle of attack envelope wing and fuselage aerodynamics, sideslip wind effect and actuator dynamics. A unified formulation comprising all model components is derived to...
This paper proposes a Quasi-Monte Carlo (QMC) simulation based multi-objective economic dispatch, which aims to reduce the fuel cost and emission of the grid simultaneously. During the simulation, QMC models the stochastic behaviours of wind speed and distributed loads with low-discrepancy sequences. In comparison with conventional Monte Carlo (MC) simulation, the computational complexity of QMC is...
A simple but powerful and efficient NBTI recovery model is presented. Calibration is performed with a wide set of stress and recovery sequences measured under various voltages. The model provides easy-to-use tools for analytical representation of NBTI behavior as well as compatibility for sophisticated circuit reliability simulations. Regarding circuit operation and transistor characterization, the...
A poor facility design can be costly, and may lead to poor-quality products, low employee morale and customer dissatisfaction. Typically, the facility layout is decided when the facilities are first set up. However, product variety, process improvement and technology improvement can make the original layout plan inefficient. Since the facility layout problem is a NP-hard problem, an optimal solution...
Bisimulation relation as a well known equivalence relation has been successfully applied to computer science and control theory. In our previous work, we proposed the existence of bisimilarity supervisor by introducing simulation-based controllability. As a continuation, this paper deals with the computation for the supremal simulation-based controllable subautomata with respect to given specifications...
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